Connection device



0d. 17, 1933. J FRANK 1,931,318

CONNECTION DEVICE Original Filed Aug. 1925 INVENTOR.

M Y-XM A TTORNEY.

Patented Oct. 17, 1933 UNITED STATES PATENT OFFICE CONNECTION DEVICE Harrison J. L. Frank, Highland Park, Mich., as-

signor to Bulldog Electric Products Company, Detroit, Mich., a corporation of West Virginia 12 Claims.

The present invention relates to sockets for electrical devices such as plug fuses, lamps, etc.

An object of this invention is a socket, inside the cross sectional area of which all electrical and mechanical connections are made.

Another object is a socket in which all the live parts are shielded by the block in which the socket is mounted, thus eliminating the necessity for additional barriers.

Still another object is a socket in which the shell makes direct contact with the lead wire, instead of having several points thru which the current may pass.

Still other objects will readily occur to those skilled in the art upon reference to the follow ing description and the accompanying drawing in which Fig. 1 is a plan view of Fig. 2.

Fig. 2 is a section of a block containing one embodiment of the invention, on line 2-2, Fig. 1.

Fig. 3 is a section of a modified form.

Fig. 4 is a detail of the same.

Referring to the drawing, Fig. 2 shows a fuse block or panel 80 of insulating material having a depression 81 in one face thereof, there being a bus bar 82 on the opposite face of the block and aligned with said depression. Centrally of the depression is a non-circular or oval boss 100 around which is disposed the shell 102 having the conventional screw threads 102a and having an apertured bottom to engage the boss 100 so as to hold said shell non-rotatable with respect to said depression.

The shell 102 is secured to the block 80 by the screw 101 in the boss 100, the latter having a portion threaded into the bus-bar 82, as shown, and having a head 101a which clamps the bottom of the shell against the block 80 by means of the washer 103 and the insulating washer 104, the latter resting on one of the tongues 105 bent up from and integral with the shell bottom. In the side wall of the shell and also in the block 80, are aligned apertures 10% which afford an entrance way for one or more leads 105a to be electrically connected and'mechanically secured to said shell, the lead ends being clamped by washer 104; between a tongue 105 and the shell bottom.

The function of the parts is readily seen. Current from the bus 82 is led thru the screw 101, head 1010;, to the center contact of the associated electric device, fuse plug, lamp, etc., and current from the shell of the latter is led from the shell 102 thru tongue 105 to the outgoing lead.

In this manner the electrical and mechanical connections are readily made wholly within the cross sectional area of the shell, thus enabling the block 80 to be made more compact.

It will be observed that screw 101 performs at least four important functions; (a) it secures the bus bar 82 to the block (b) it secures shell 102 to the block; (0) it provides a center contact for the socket; and (d) it connects and secures the lead Wire to the shell 102.

In the modification of Figs. 3 and 4, the bottom of the shell 102 is left flat, and the tongues 105 are replaced by a separate metallic washer 107 having tongues 106 each serving to clamp the end of a lead 110.

Further, the washer 103 is replaced by the enlarged head 108 of the screw 101.

This application is a division of application Ser. No. 49,709, filed August 12, 1925 which resulted in Patent No. 1,833,158, November 24, 1931. 75

Now, having described the invention and the preferred embodiment thereof, it is to be understood that the invention is not to be limited to the precise details herein given, but only by the scope of the claims which follow.

I claim:-

1. A block having a depression therein, a screw shell in said depression, and means for connecting a wire to said shell, said means consisting of a screw threaded thru the bottom of said shell, there being alined' passages thru the side wall of the depression and the shell side wall, closely adjacent but above the level of the shell bottom, for insertion of a wire which is adapted to be secured by said screw in direct contact with the 'shell bottom, the wire being substantially unbent and undisturbed until the screw is tightened to clamp the wire end in place.

2. A block, a screw shell thereon, a center contact screw within and insulated from said shell and threaded thru the bottom and spaced from the side wall thereof, said shell having a tongue spaced from the bottom portion at a distance from the screw head and within the shell, a wire end between the tongue and the bottom, and means including the screw to force said tongue towards said bottom portion to secure the wire end against the bottom.

3. In a socket which has a metal screw shell,

a metal tongue within said shell and adjacent to the bottom of said shell, and means for forcing said tongue towards the shell bottom, said means comprising a screw insulated from said shell and tongue and having a head which forms the center contact for the socket.

4. In a socket which has a metal screw shell, a tongue within said shell and adjacent to the bottom and adapted to overlie the end of a lead wire disposed between the tongue and the bottom, and means for forcing the tongue against said wire and then towards the shell bottom, said means including an insulating piece resting on said tongue and a screw adapted to press upon said piece, said screw being insulated from the shell and having a head which serves as the center contact for said socket. I

5. In a socket having a metal screw shell, 2. metal washer in said shell and resting on and in contact with the bottom of said shell, said washer having a tongue bent upwardly from the shell bottom and adapted to lie above and engage the end of a lead wire, a second washer of insulating material resting on said first washer, and a center screw whose head rests on the second washer and whose shank projects thru the washers and the shell bottom and is adapted to press downwardly on said second washer, to hold both washers and the wire end in place in said shell, said screw being insulated from said shell and first washer.

6. In combination, an insulating block, a screw shell on one side of said block and a bus bar on the other, a conductor end in said shell adjacent the bottom thereof, and a screw for securing said shell and said bar to said block, said screw being completely insulated from said conductor end and said shell and having a head which forms a center contact therefor, and which also serves to clamp in place said conductor end.

'7. In combination, an insulating block having a non-circular boss projecting therefrom, a bus bar on one side of said block, a shell on the other side of said block and having a non-circular aperture receiving said boss, a conductor end in said shell adjacent the bottom thereof, and means to secure said shell to said block and to clamp said conductor end to the shell bottom and to secure the block to the bus bar, said means comprising a screw whose head is within the shell to serve as a center contact, and whose shank is threaded thru said block into the bus bar, said screw being completely insulated from said shell and said conductor end.

8. In combination, an insulating block having a non-circular boss on one side and a bus bar on the other side thereof, a shell on said block having a non-circular aperture receiving said boss, and a screw to secure said shell and bar to said block, said screw being insulated from said shell and serving as a center contact therefor, and also serving to clamp in place a conductor whose end is within and against the bottom of said shell.

9. In combination, a block of insulating material having a noncircular boss and a screw shell on one side thereof, the bottom of the shell having a noncircular hole receiving the boss, a screw passed substantially centrally thru the boss and the shell hole and having a head within the shell, a conductor wire having an end passed thru a sidewall aperture of said shell and disposed within the latter and adjacent the bottom thereof, and an insulating washer in said shell engaging and between the screw head and the wire end and serving to clamp the end in place in the shell when the screw is tightened down.

10. In combination, a block of insulating material having a boss and a screw shell on one side thereof, the bottom of the shell having a hole receiving the boss, a screw passed substantially centrally thru the boss and the shell hole and having a head within the shell, a conductor wire having an end passed thru a side wall aperture of said shell and disposed within the latter and adjacent the bottom thereof, and an insulating washer in said shell engaging and between the screw head and the wire end and serving to clamp the end in place in the shell when the screw is tightened down.

11. In combination, a block of insulating material having a boss and a screw shell on one side thereof, the bottom of the shell having a hole receiving the boss, a screw passed substantially centrally thru the boss and the shell hole and having a head within the shell, a conductor wire having an end passed thru a side wall aperture of said shell and disposed within the latter and adjacent the bottom thereof, and an insulating washer in said shell engaging and between the screw head and the wire end and serving to clamp the end in place in the shell when the screw is tightened down, the other side of the block having a bus bar into which the shank of the screw is threaded.

12. In combination, a block of insulating material having a depression in the face thereof, a screw shell in said depression having a bottom thru which a headed binding screw is passed, the screw head being within the shell, the shell having an aperture in its side wall above the level of, but close to the bottom of the shell, the block having an aperture opening to its outside and to the depression wall and aligned with the shell aperture, and a flexible elongated conductor passed thru said apertures and having its bared end disposed in said shell and clamped between the bottom thereof and the screw head, the conductor being substantially unbent and undistorted until the screw is tightened down to clamp the conductor end in place.

HARRISON J. L. FRANK.

-CERTIFICATE OF GOMEC'I'IOR. 7

Patent No. 1,931,518. October 17, 1933.

Harrison J. L. Frank.

It is hereby certified that error appears in the above numbered patent requiring correction as follows; In the drawing, Figure 4 should appear as ehown below, as part of the Letters Patent:

and that the said. Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office Signed and sealed this 12th day of March, A-D. 1935- Leslie Frazer Acting Commissioner of Patents. 

